Without a great adversary, what good is a superhero? Without someone to punch in the face, Batman would just be some rich schmuck driving around in a weird-looking tank. Without someone on the receiving end of his shield, Captain America would just hang out at the V.F.W. all day. So let’s celebrate the villains. Let’s bring on the bad guys and give them their moment in the sun. With Avengers: Age of Ultron introducing another memorable baddie in the form of James Spader’s titular metallic menace, let’s take some time to run down the 10 greatest superhero movie villains of all time.